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  • Open Access


    Prediction of Geopolymer Concrete Compressive Strength Using Convolutional Neural Networks

    Kolli Ramujee1,*, Pooja Sadula1, Golla Madhu2, Sandeep Kautish3, Abdulaziz S. Almazyad4, Guojiang Xiong5, Ali Wagdy Mohamed6,7,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.139, No.2, pp. 1455-1486, 2024, DOI:10.32604/cmes.2023.043384

    Abstract Geopolymer concrete emerges as a promising avenue for sustainable development and offers an effective solution to environmental problems. Its attributes as a non-toxic, low-carbon, and economical substitute for conventional cement concrete, coupled with its elevated compressive strength and reduced shrinkage properties, position it as a pivotal material for diverse applications spanning from architectural structures to transportation infrastructure. In this context, this study sets out the task of using machine learning (ML) algorithms to increase the accuracy and interpretability of predicting the compressive strength of geopolymer concrete in the civil engineering field. To achieve this goal, a new approach using convolutional… More >

  • Open Access


    Efficient Use of Steel Slag in Alkali-Activated Blast Furnace Slag Based Geopolymer

    Yu Bai, Lei Wang, Ying Fang*

    Journal of Renewable Materials, Vol.11, No.7, pp. 3129-3141, 2023, DOI:10.32604/jrm.2023.026923

    Abstract Energy shortage and the emission of greenhouse gases have become a global problem of urgent concern. Therefore, there is an urgent need to develop a low carbon building material. Geopolymers have become a hot topic due to their environmental sustainability and the feasibility of immobilizing industrial waste. In this paper, steel slag (SS) fines were investigated as auxiliary materials of blast furnace slag (BFS) based geopolymer. The hydration heat properties, flowability, compressive strength, sorptivity coefficient, X-ray diffraction (XRD), and scanning electron microscopy (SEM) of the geopolymer pastes were determined. The results showed that the incorporation of SS weakened the reactivity… More >

  • Open Access


    Experimental Study on Ratio and Performance of Coal Gangue/Bottom Ash Geopolymer Double-Liquid Grouting Material

    Wenqi Zhao1, Wenbin Sun1,2,3,*, Zhenbo Cao1, Jianbang Hao1

    Journal of Renewable Materials, Vol.11, No.7, pp. 3073-3089, 2023, DOI:10.32604/jrm.2023.026409

    Abstract Mine grouting reinforcement and water plugging projects often require large amounts of grouting materials. To reduce the carbon emission of grouting material production, improve the utilization of solid waste from mining enterprises, and meet the needs of mine reinforcement and seepage control, a double-liquid grouting material containing a high admixture of coal gangue powder/bottom ash geopolymer was studied. The setting time, fluidity, bleeding rate, and mechanical properties of grouting materials were studied through laboratory tests, and SEM analyzed the microstructure of the materials. The results show that the total mixture of calcined gangue does not exceed 60%. And the proportion… More >

  • Open Access


    Elevated Temperature Properties of Bamboo Shaving Reinforced Geopolymer Composites

    Xinli Zhang1, Jiayu Zhang1, Zuhua Zhang2,*, Yiqiang Wu1,*, Yingfeng Zuo1

    Journal of Renewable Materials, Vol.11, No.1, pp. 27-40, 2023, DOI:10.32604/jrm.2023.023400

    Abstract Geopolymer is a new alternative cement binder to produce concrete. In the present study, a novel geopolymer composites containing bamboo shaving (0–2 wt.%) were fabricated and exposed to the temperatures of 200°C, 400°C, 600°C and 800°C. Physical properties, micro-structure, and mechanical strengths of the geopolymer composites were evaluated before and after heating in order to understand their thermal properties, which are essential for the use as building materials. As the temperature rises, the drying shrinkage and apparent porosity of the composites increase, while the compressive and bending strengths decrease. At the temperature range of 200°C–800°C, the residual compressive strength rates of… More >

  • Open Access


    Synthesis and Characterization of a Novel Bamboo Shaving Geopolymer Composite

    Jiayu Zhang, Zhenyang Li, Xinli Zhang*

    Journal of Renewable Materials, Vol.10, No.11, pp. 2871-2881, 2022, DOI:10.32604/jrm.2022.019373

    Abstract Geopolymers are inorganic aluminosilicate materials, which have been a great research interest as a material for sustainable development. However, they possess relatively low toughness properties similar to brittle solids. The limitation may be altered by fiber reinforcement to improve their strength and toughness. This research describes the synthesis of bamboo shaving (BS) reinforced geopolymer composites and the characterization of their mechanical properties. The effect of BS content (0–2 wt. %) on the physical and mechanical properties and microstructure of metakaolin based geopolymer paste were investigated. The workability, setting time, bulk density, apparent porosity, thermal conductivity, compressive strength, flexural strength, scanning… More >

  • Open Access


    Influences of Multi-Component Supplementary Cementitious Materials on the Performance of Metakaolin Based Geopolymer

    Wu Jing1,2,#, Ren Luo3,#, Sha Ding2, Ping Duan3,4,5,6,7,*

    Journal of Renewable Materials, Vol.10, No.7, pp. 1813-1828, 2022, DOI:10.32604/jrm.2022.018771

    Abstract In this study, the workability and reaction mechanism of metakaolin (MK) based geopolymer blended with rice husk ash (RHA) and silica fume (SF) was investigated. The prepared samples were subjected to tests including compressive strength and fluidity tests. X-ray diffraction (XRD) and Scanning electron microscope (SEM) were employed to explore the phase composition and microstructure of geopolymers. The molecular bonding information of geopolymer was provided by Fourier transform infrared spectroscopy (FTIR). Meanwhile, the porosity of geopolymer was obtained by Mercury intrusion porosimeter (MIP) analysis. The high-activity RHA obtained after calcination at 600°C was used as a supplementary cementitious material to… More > Graphic Abstract

    Influences of Multi-Component Supplementary Cementitious Materials on the Performance of Metakaolin Based Geopolymer

  • Open Access


    An α-Fe2O3/Circulating Fluidized Bed Fly Ash Based Geopolymer Composite Anode for Electrocatalytic Degradation of Indigo Carmine Dye Wastewater

    Jiaqian Lei, Yaojun Zhang*, Panyang He

    Journal of Renewable Materials, Vol.9, No.12, pp. 2277-2289, 2021, DOI:10.32604/jrm.2021.015824

    Abstract Geopolymers have been developed to various catalysts due to their advantages. However, low conductivity restricts their application in the electrocatalysis field. In this study, an α-Fe2O3/circulating fluidized bed fly ash based geopolymer (CFAG) composite anode was fabricated using a facile dip-coating method by loading α-Fe2O3 in the matrix of CFAG. The effects of α-Fe2O3 content on the composition, surface morphology and electrochemical performance of α-Fe2O3/CFAG composite anode were investigated. The X-ray diffraction (XRD) and scanning electron microscope (SEM) results demonstrated that α-Fe2O3 was successfully inlaid with the surface of amorphous CFAG matrix. The electrochemical measurements indicated that α-Fe2O3/CFAG composite anode… More > Graphic Abstract

    An α-Fe<sub>2</sub>O<sub>3</sub>/Circulating Fluidized Bed Fly Ash Based Geopolymer Composite Anode for Electrocatalytic Degradation of Indigo Carmine Dye Wastewater

  • Open Access


    Feasibility Study on Fabrication of Geopolymer Bricks by Wasted Grinding Wheel at Room Temperature

    Yi-Che Hsieh1,*, Ta-Wui Cheng2, Chia-Ho Wu2

    Journal of Renewable Materials, Vol.8, No.12, pp. 1657-1670, 2020, DOI:10.32604/jrm.2020.013353

    Abstract In this study, the feasibility of producing eco-friendly bricks by using geopolymer technology and a waste grinding wheel (WGW) from the grinding wheel industries was investigated. Nowadays, in order to meet industrial needs, for instance, in Taiwan, approximately 500,000 grinding wheels are used annually. That is, a large number of “waste” grinding wheels are produced. Furthermore, few studies have been conducted on the use of WGWs as raw materials in geopolymer applications. The use of geopolymer technology to form bricks can avoid the utilization of clay and cement and even prevent the use of a high-temperature process in kilns. Moreover,… More >

  • Open Access


    Nonlinear Elastic-Plastic Analysis of Composite Members of High-Strength Steel and Geopolymer Concrete

    Mark Andrew Bradford1, Yong-Lin Pi1

    CMES-Computer Modeling in Engineering & Sciences, Vol.89, No.5, pp. 389-416, 2012, DOI:10.3970/cmes.2012.089.389

    Abstract This paper is devoted to the development of a finite composite beam element for the nonlinear elastic-plastic analysis of composite high strength steel and geopolymer concrete members. For this, geometric nonlinearity is derived using a special orthogonal rotation matrix, so that scalar product of vectors is preserved during rotation from the initial configuration to a deformed configuration and rigid body movements are excluded from the finite strains. The material nonlinearities of the geopolymer concrete are based on constitutive models in association with its axial stress-strain relationship that is consistent with the experimental results. To consider the slip due to possible… More >

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